JP2011136829A - Image recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image recording device capable of easily removing a sheet member, even when the sheet member is jammed in a carrying passage arranged between an image recording part and a tray. <P>SOLUTION: A lower side guide member 90 is arranged between the image recording part 24 and a paper feeding tray 78. The lower side guide member 90 includes a front guide plate 91 on the front side, a rear guide plate 92 on the rear side and a rotary shaft 93 for rotatably supporting these guide plates. When the paper feeding tray 78 is not installed, the front end of the front guide plate 91 and the rear end of the rear guide plate 92 descend downward, and thus, jam processing in a reversal carrying passage 67 is facilitated. When the paper feeding tray 78 is installed, the respective guide plates 91 and 92 are pushed upward by the paper feeding tray 78, and the reversal carrying passage 67 is formed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image recording apparatus that records images on both sides of a sheet member, and more particularly, to an image recording apparatus having a conveyance path for switching back a sheet member that has passed through an image recording unit and returning it to the image recording unit again.

  Conventionally, an image recording apparatus capable of recording images on both sides of a recording sheet (sheet member) is known. In Patent Document 1 and Patent Document 2, an image recording unit is provided on the upper side of the sheet tray in order to realize a compact apparatus, and the sheet tray and the image recording unit are connected by a curved conveyance path. A recording device is disclosed. In this type of image recording apparatus, when performing double-sided image recording, the recording paper that has passed through the image recording unit is switched back and conveyed to the sheet tray again, and the recording paper is conveyed again to the image recording unit by the feeding roller. (See Patent Documents 1 and 2). Accordingly, the conveyance path through which the sheet is fed from the sheet tray can be used as the conveyance path guided after the switchback, so that the apparatus can be thinned.

  In addition, a large and self-supporting copying machine (copier) that is widely used in offices and the like is not limited in height, so that it is located between the image recording unit and the sheet tray separately from the conveyance path through which paper is fed. Is provided with a transport path for switchback. In this copying apparatus, the recording paper that has passed through the image recording section is switched back and then transported again to the image recording section through the switchback transport path.

JP 2009-83232 A JP 2009-1412 A

  However, in the image recording apparatuses described in Patent Documents 1 and 2, when the recording paper after switchback is conveyed by the feeding roller, the feeding roller comes into contact with the image recording surface. Therefore, there is a possibility that the image recording surface is soiled by the contact of the paper feed roller. In addition, a recording material (ink, toner, etc.) adhering to the image recording surface may adhere to the paper feed roller, and the adhering recording material moves to the next recording paper fed by the paper feed roller, and the recording paper There is also a risk of soiling. On the other hand, the problem can be solved by providing a transport path different from the transport path at the time of paper feeding as employed in the above-described large copying apparatus. However, in order to meet the social demand for thinner devices, if the design is such that there is no extra space between the image recording unit and the sheet tray, and the height of the device is made as compact as possible, If the recording paper is jammed in another conveyance path, the operation of removing the jammed recording paper becomes extremely difficult.

  Therefore, the present invention has been made in view of the above problems, and even when the sheet member is jammed in the conveyance path provided between the image recording unit and the tray, the sheet member can be easily removed. An object is to provide an image recording apparatus.

(1) The present invention is an image recording apparatus including a tray, an image recording unit, a back cover, a guide member, a rotating shaft, an applying unit, a first support mechanism, and a second support mechanism. It is configured. The tray is provided so that it can be inserted into and removed from the apparatus main body from the front of the apparatus main body. A sheet member on which an image is recorded is held on the tray. The image recording unit is provided on the upper side of the tray. The back cover is provided on the back surface of the apparatus main body so as to be opened and closed. The back cover forms a curved curved conveyance path from the tray to the image recording unit in a state of being closed with respect to the back surface of the apparatus main body, and opens the curved conveyance path in an opened state. The guide member has a first guide plate and a second guide plate provided between the tray and the image recording unit. The guide member guides the sheet member that has passed through the image recording unit to the curved conveyance path sequentially through the second guide plate and the first guide plate. The rotation shaft rotatably supports the second guide plate with the front end as a rotation free end, and the first guide plate with the back end as a rotation free end. To support. The applying means applies a downward biasing force to the first guide plate so that a downward moment acting on the first guide plate is larger than a downward moment acting on the second guide plate. The first support mechanism resists the moment so as to be in a first posture capable of guiding the sheet member to the curved conveyance path in response to the insertion of the tray into the apparatus main body. Support. Further, the second support mechanism has a second posture in which each of the guide plates rotated downward by releasing the support by the first support mechanism when the tray is removed from the apparatus main body has a predetermined angle. The guide member is supported so as to be.

  Due to such a configuration, a conveyance path (hereinafter referred to as “reverse conveyance path”) is formed by the guide member between the image recording unit and the tray. This reverse conveyance path is for guiding the sheet member that has passed through the image recording section to the curved conveyance path. When the tray is extracted from the apparatus main body, the guide member is not supported by the first support mechanism. At this time, the first guide plate is rotated downward about its rotation axis by its own weight and the urging force of the applying means. Thereby, the back side of the reversing conveyance path is expanded in the height direction. For this reason, even when the sheet member is jammed in the reversal conveyance path, the jammed sheet member can be easily accessed by opening the back cover, so that the sheet member can be easily removed. Further, the second guide plate is rotated downward by its own weight around the rotation axis. Thereby, the front side of the reversal conveyance path is expanded in the height direction. For this reason, even when the sheet member is jammed in the reverse conveyance path, the jammed sheet member can be easily accessed from the front side from which the tray is extracted, so that the sheet member can be easily removed.

(2) The image recording apparatus of the present invention further includes a pair of conveyance rollers. The pair of conveying rollers includes two rollers pressed in the vertical direction, and conveys the sheet member guided by the guide member toward the curved conveying path. One of the rollers of the conveying roller pair is rotatably supported by the rotation shaft.

  Thereby, since the said rotating shaft can be combined as a spindle which supports a roller, an apparatus can be made more compact. Further, with the portion where the conveying roller pair is located as a fulcrum, the end portion on the back side of the first guide plate is lowered and the end portion on the front side of the second guide plate is lowered. For this reason, even when the sheet member is jammed while being sandwiched between the pair of conveying rollers, the sheet member can be easily removed from either the front side or the back side of the apparatus main body.

(3) The predetermined angle is an angle at which the front end portion of the second guide plate can be stopped at a position away from the bottom surface of the apparatus body in a state where the tray is removed from the apparatus body. It is preferable.

  When the tray is extracted from the apparatus main body, first, the first guide plate is not supported, so the first guide plate rotates downward and reaches a predetermined position. Thereafter, the support of the second guide plate is lost, and the second guide plate rotates downward. At this time, since the downward biasing force is applied to the first guide plate by the applying means, the first guide plate rotates independently until it reaches the second posture. At this time, the first guide plate and the second guide plate are supported by the second support mechanism. A larger moment acts on the first guide plate than on the second guide plate. Therefore, the second guide plate is lifted by a force larger than its own weight and stops at a position separated from the bottom surface of the apparatus main body. Thereby, even if the tray is extracted, the second guide plate does not collide with the bottom surface of the apparatus main body. Therefore, the second guide plate is prevented from being damaged due to the collision with the tray, and the collision sound is suppressed.

(4) The image recording apparatus of the present invention further includes a feeding roller that feeds the sheet member held on the tray to the curved conveyance path. The feeding roller is provided between the tray and the guide member. An elastic member is provided on the roller surface of the feeding roller. In this configuration, the first guide plate rotates downward when the tray is removed from the apparatus main body, and comes to rest by contacting the roller surface of the feeding roller.

  Thereby, even if the first guide plate is lowered and collides with the feeding roller, the impact is absorbed by the elastic member, so that the collision noise is suppressed.

(5) As a specific configuration of the first support mechanism, a mechanism including a first engagement portion, a first support portion, a second engagement portion, and a second support portion can be considered. The first engaging portion is provided on the lower surface of the first guide plate. The first support part is engaged with the first engagement part when the tray is mounted on the apparatus main body, and supports the first guide plate to be lifted from below. The second engaging portion is provided on the lower surface of the second guide plate. The second support portion supports the second guide plate to be lifted from below by engaging with the second engagement portion when the tray is mounted on the apparatus main body.

(6) As a specific configuration of the second support mechanism, a mechanism having a protruding piece protruding from the vicinity of the rotation shaft of one of the guide plates is conceivable. The angle formed by each guide plate is maintained at the predetermined angle by the tip of the projecting piece abutting against the other guide plate.

  According to the present invention, even when the sheet member is jammed in the conveyance path provided between the image recording unit and the tray, the sheet member can be easily removed.

FIG. 1 is an external perspective view of a multifunction machine 10 that is an embodiment of an image recording apparatus of the present invention. FIG. 2 is a longitudinal sectional view schematically showing the internal configuration of the printer unit 11. FIG. 3 is a plan view schematically showing the configuration of the paper feed tray 78. FIG. 4 is a schematic diagram illustrating the configuration of the lower guide member 90. FIG. 5 is a schematic cross-sectional view for explaining the operation of the lower guide member 90. FIG. 6 is a schematic diagram showing the configuration of the lower guide member 90 according to a modification of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings as appropriate. The embodiment described below is merely an example of the present invention, and it is needless to say that the embodiment of the present invention can be changed as appropriate without departing from the gist of the present invention.

[Schematic configuration of MFP 10]
FIG. 1 is a schematic perspective view showing an external configuration of a multifunction machine 10 which is an embodiment of an image recording apparatus of the present invention. In the following description, the vertical direction 7 is defined with reference to the state in which the multifunction machine 10 is installed (the state shown in FIG. 1), and the side where the opening 13 is provided is the front side (front side). ) Is defined as the front-rear direction 8, and the left-right direction 9 is defined when the multifunction machine 10 is viewed from the front side (front).

  As shown in FIG. 1, the multifunction machine 10 is a thin rectangular parallelepiped having a large width (length in the left / right direction 9) and depth (length in the front / rear direction 8) with respect to the height (length in the up / down direction 7). It is generally formed in shape. The multifunction machine 10 is a multi-function device that mainly includes an ink jet recording type printer unit 11 provided in a lower part and a scanner part 12 provided in an upper part. The multifunction machine 10 has various functions such as a facsimile function, a print function, a scan function, and a copy function. The print function includes a double-sided image recording function for recording images on both the front surface (first surface) and the back surface (second surface) of recording paper (an example of the sheet member of the present invention). Functions other than the print function are arbitrary. For example, the image recording apparatus of the present invention may be implemented as a printer having no scan function, copy function, or facsimile function.

  The printer unit 11 has a printer housing 14 (an example of the apparatus main body of the present invention) having an opening 13 formed on the front surface. Each component of the printer unit 11 is arranged inside the printer housing 14. An accommodation space is defined so as to continue from the opening 13 to the inside of the printer housing 14. A paper feed tray 78 (an example of a tray according to the present invention) is mounted in this accommodation space. The paper feed tray 78 is configured to be insertable / removable in the front-rear direction 8 (horizontal direction) from the opening 13 to the inside of the printer housing 14. The paper feed tray 78 is configured to hold various types of recording paper such as A4 size recording paper (A4 paper) and postcards. Hereinafter, the configuration of the printer unit 11 will be described in detail. A description of the configuration of the scanner unit 12 is omitted.

[Configuration of Printer Unit 11]
Hereinafter, the configuration of the printer unit 11 will be described in detail with reference to FIG. FIG. 2 is a longitudinal sectional view schematically showing the internal configuration of the printer unit 11. In addition, illustration of the front part is abbreviate | omitted in FIG.

  The printer unit 11 mainly includes a paper feeding tray 78, a feeding unit 15 that picks up and feeds recording paper from the paper feeding tray 78, and ink on the recording paper fed by the feeding unit 15. An ink jet recording type image recording unit 24 (an example of the image recording unit of the present invention) that discharges droplets to form an image on a recording sheet, a path switching unit 41, and a recorded recording sheet discharged to the outside are held. And a control unit (not shown) for controlling the operation of the printer unit 11. Each of these components is provided in the printer housing 14. The image recording unit 24 is not limited to the ink jet system, and various recording systems such as an electrophotographic system or a thermal recording system can be applied. The paper discharge tray 79 may be integrated with the paper feed tray 78 or may be fixed to the frame of the printer housing 14 or the like.

[Paper transport path 65]
Inside the printer unit 11, a paper conveyance path 65 is formed extending from the front end (rear end) of the paper feed tray 78 toward the upper front side and reaching the paper discharge tray 79 through the image recording unit 24. Has been. As the recording paper passes through the paper conveyance path 65, the recording paper is guided from the paper feed tray 78 to the paper discharge tray 79. The paper conveyance path 65 includes a curved curved path 65A (an example of a curved conveyance path according to the present invention) formed between the leading end of the paper feed tray 78 and the image recording section 24, and a paper discharge tray from the image recording section 24. 79, and a paper discharge path 65B formed in the middle.

  As shown in FIG. 2, the curved path 65 </ b> A is a curved path extending from the vicinity of the upper end of the separation inclined plate 22 provided in the paper feed tray 78 to the image recording unit 24. The curved path 65A is disposed so as to face the back cover 18 (an example of the back cover of the present invention) provided on the back side of the printer housing 14 and at a predetermined distance from the back cover 18 to the front side. The inner guide member 19 is divided. The back cover 18 and the inner guide member 19 are generally formed in an arc shape centering on the inner side of the printer unit 11.

  The back cover 18 forms the outer guide surface of the curved path 65 </ b> A and forms the back surface of the printer housing 14. The back cover 18 is provided so as to be openable and closable with respect to the back surface of the printer housing 14. Specifically, the back cover 18 has a closed position (at the position indicated by a solid line in FIG. 2) covering the back surface of the printer casing 14 around a support shaft 20 provided at the lower part of the printer casing 14. It is supported so as to be openable and closable with respect to an open posture (posture indicated by a wavy line in FIG. 2) that opens away from the printer housing 14 and opens the curved path 65A. When the back cover 18 is in the closed posture, the outer guide surface of the curved path 65A is formed by the inner surface thereof. Since such a back cover 18 is provided, even when the recording paper is jammed in the curved path 65A, the jammed paper can be easily removed by opening the back cover 18.

  The paper discharge path 65 </ b> B is partitioned by an upper paper discharge guide 82 and a lower paper discharge guide 83 provided in front of the image recording unit 24.

  A branch port 36 is formed on the front side of the lower paper discharge guide 83. During double-sided image recording, the recording paper conveyed through the paper discharge path 65B is switched back downstream of the branch port 36 and conveyed toward a reverse conveyance path 67 described later.

[Image Recording Unit 24]
The image recording unit 24 is disposed on the upper side of the paper feed tray 78. The image recording unit 24 is configured to reciprocate along a guide rail (not shown) extending in the direction perpendicular to the paper surface (left-right direction 9) in FIG. A platen 42 is provided below the image recording unit 24. The platen 42 supports the recording paper horizontally when image recording is performed by the image recording unit 24. In the reciprocating process in the main scanning direction, the image recording unit 24 discharges ink supplied from an ink cartridge (not shown) as fine ink droplets from a nozzle 39 onto a recording sheet conveyed on the platen 42. Thereby, an image is recorded on the recording paper.

  The paper transport path 65 is provided with a first transport roller 60 and a second transport roller 62 for sandwiching and transporting the recording paper. The image recording unit 24 is provided between the first conveyance roller 60 and the second conveyance roller 62. A pinch roller 61 is pressed against the first transport roller 60, and a spur 63 is pressed against the second transport roller 62. The first transport roller 60 and the second transport roller 62 are rotated by a rotational driving force transmitted from a transport motor (not shown) via a drive transmission mechanism (not shown). In the present embodiment, a rotational driving force for rotating a later-described third transport roller 45 in the forward rotation direction or the reverse rotation direction is also supplied from the transport motor. Therefore, as a drive transmission mechanism to the first transport roller 60 and the second transport roller 62, the recording paper is moved in one direction (right side in FIG. 2) regardless of whether the transport motor is rotated in the forward rotation direction or the reverse rotation direction. ), A mechanism that always rotates the first transport roller 60 and the second transport roller 62 in one rotation direction by a planetary gear or the like is employed. In addition, when the drive source of the 1st conveyance roller 60 and the 2nd conveyance roller 62 and the drive source of the 3rd conveyance roller 45 are provided separately, the said drive transmission mechanism is restricted to the structure containing the said planetary gear. I can't.

[Feeding unit 15]
The feeding unit 15 is provided between the image recording unit 24 and the paper feed tray 78, and more specifically, between a lower guide member 90 and a paper feed tray 78, which will be described later. The feeding unit 15 is for conveying the recording paper stored in the paper feeding tray 78 toward the curved path 65A, and includes a paper feeding roller 25 (an example of the feeding roller of the present invention) and an arm-like shape. A sheet feeding arm 26 made of members and a drive transmission mechanism 27 are provided.

  The paper feed roller 25 is held by a paper feed tray 78 to pick up recording paper one by one and feed it to the curved path 65A. The paper feed roller 25 is made of an elastic member such as silicon or NBR in order to increase the contact friction with the recording paper. Of course, an elastic member may be coated on the roller surface of the resin paper feeding roller 25. The paper feed roller 25 is rotatably supported at the tip of the paper feed arm 26. The paper feed roller 25 is rotationally driven by the rotational force of a paper feed motor (not shown) as a drive source being transmitted via the drive transmission mechanism 27. The drive transmission mechanism 27 is pivotally supported by the paper feed arm 26 and is composed of a plurality of gears arranged in a substantially straight line along the extending direction of the paper feed arm 26.

  A base shaft 28 is provided between the image recording unit 24 and the paper feed tray 78. The paper feed arm 26 has a base end supported by a base shaft 28 and is configured to be rotatable about the base shaft 28 as a rotation center. For this reason, the paper feed arm 26 can move up and down so as to be able to contact and separate from the paper feed tray 78. The paper feeding arm 26 is urged to rotate in the direction of an arrow 29 in FIG. 2 by its own weight or by an elastic force of an elastic member such as a spring. For this reason, for example, when the paper feed tray 78 is disposed below the paper feed roller 25, the paper feed roller 25 is pressed against the upper surface of the recording paper held in the paper feed tray 78. The paper feed arm 26 is configured to be pushed upward by the paper feed tray 78 when the paper feed tray 78 is inserted into the printer housing 14.

[Paper Tray 78]
As shown in FIG. 2, the paper feed tray 78 is provided below the paper feed unit 15 and is disposed at the bottom of the printer housing 14.

  FIG. 3 is a plan view schematically showing the configuration of the paper feed tray 78. As shown in FIGS. 2 and 3, the paper feed tray 78 is erected upward from both the bottom plate 54 on which the recording paper is placed, and both ends of the bottom plate 54 in the left-right direction 9, and along the front-rear direction 8. Side plates 55 and 56 that extend, and a separation inclined plate 22 that is provided at the rear end of the bottom plate 54 and that extends along the left-right direction 9 are provided. The paper feed tray 78 is configured in a generally rectangular box shape with an open top surface. The separation inclined plate 22 is inclined rearward so that the recording paper can be fed smoothly. As described above, the recording paper is fed from the rear end portion of the paper feed tray 78 to the curved path 65A behind and above the end portion.

  In addition, a pair of support portions 57 (an example of the first support portion and the second support portion of the present invention) are provided at both left and right ends of the paper feed tray 78. The support portion 57 is configured integrally with each of the side plate 55 and the side plate 56. One support portion 57 is a plate member that extends from the upper end of the side plate 55 toward the center in the width direction of the paper feed tray 78, and the other support portion 57 extends from the upper end of the side plate 56 to the center in the width direction of the paper feed tray 78. It is an extending plate member. These two support portions 57 together with the protrusion 101 and the protrusion 102 described later constitute a first support mechanism of the present invention.

  The bottom plate 54 of the paper feed tray 78 is provided with a pair of side guides 75 extending along the front-rear direction 8. The paper feed tray 78 is provided with a known mechanism for interlocking the side guide 75. Therefore, for example, when one side guide 75 is slid in any one of the left and right directions 9 (rightward), the other side guide 75 is slid in the opposite direction (leftward) in conjunction with this sliding operation. For this reason, when the width of the recording paper placed on the bottom plate 54 is narrower than the separation distance between the pair of side guides 75, the side guide 75 is slid toward both ends of the recording paper, so that the width direction of the recording paper is reached. The center position in the (left-right direction 9) substantially coincides with the center in the width direction of the paper feed tray 78. Since such a side guide 75 is provided, even if a recording paper having a size smaller than the width size of the paper feed tray 78 (for example, a postcard or L-size photo-sized glossy paper) is placed, the recording paper is used. Can be positioned in the center of the paper feed tray 78. There may be one side guide. In this case, the recording paper can be positioned between the side guide and any one of the side plates 55 and 56.

  The bottom plate 54 is provided with a rear guide 77 supported so as to be slidable in the front-rear direction 8. Therefore, the recording paper is packed to the rear side of the paper feed tray 78 by sliding the rear guide 77 toward the front end of the recording paper placed on the paper feed tray 78 and pressing the recording paper backward. Can be sent.

[Route switching unit 41]
As shown in FIG. 2, the path switching unit 41 is disposed near the branch port 36 in the paper transport path 65. The path switching unit 41 includes a third conveyance roller 45, a spur 46, and a flap 49.

  The third transport roller 45 is provided on the downstream side of the lower paper discharge guide 83. A branch port 36 is formed between the third transport roller 45 and the lower paper discharge guide 83. The third transport roller 45 is rotatably supported by the frame of the printer housing 14 or the like. The spur 46 is disposed above the third transport roller 45 and is pressed against the roller surface of the third transport roller 45 by its own weight or a spring. The spur 46 is rotatably supported at the downstream end portion of the upper discharge guide 82. The third transport roller 45 is driven to rotate in the forward rotation direction or the reverse rotation direction by receiving a driving force in the forward / reverse rotation direction from the transport motor. For example, when single-sided recording is performed, the third transport roller 45 is rotated in the forward rotation direction. As a result, the recording sheet is sandwiched between the third conveyance roller 45 and the spur 46 and discharged to the front discharge tray 79. On the other hand, when double-sided recording is performed, the rotation direction of the third conveyance roller 45 is switched from the normal rotation direction to the reverse rotation direction with the third conveyance roller 45 and the spur 46 sandwiching the rear end portion of the recording paper. .

  A support shaft 87 extending in the direction perpendicular to the plane of FIG. 2 (left-right direction 9) is provided on the frame of the printer housing 14 or the like. The flap 49 extends substantially downstream from the support shaft 87. The flap 49 is pivotally supported on the support shaft 87 so as to be rotatable. A spur 47 and a spur 48 that are separated in the extending direction are pivotally supported on the flap 49. The flap 49 is configured such that its posture can be changed, and a discharge posture (position indicated by a broken line in FIG. 2) located above the lower paper discharge guide 83 and an extended end portion 49 </ b> A from the branch port 36. It rotates between a reverse attitude (an attitude indicated by a solid line in FIG. 2) entering downward. Since such a flap 49 is provided, when the trailing edge of the recording paper passes through the flap 49 and the flap 49 assumes a reverse posture, the trailing edge of the recording paper is directed downward of the branch port 36. When the third transport roller rotates in the reverse direction, the recording paper is switched back and transported toward the reverse transport path 67.

[Reverse conveying path 67]
A reverse conveyance path 67 is formed inside the printer unit 11. The reverse conveyance path 67 branches from the branch port 36 of the paper discharge path 65B, extends backward between the image recording unit 24 and the paper supply unit 15, and is a junction part 37 in the middle of the curved path 65A. Have joined. The reverse conveying path 67 is divided into an inclined path 67A on the front side and a straight path 67B on the rear side. When the recording paper that has been switched back by the path switching unit 41 passes through the reverse conveyance path 67, the recording paper is returned to the curved path 65A again. The reverse conveyance path 67 includes an upper fixed guide plate 43 fixed to the printer casing 14 and a lower guide member 90 (an example of the guide member of the present invention) provided between the image recording unit 24 and the paper feeding unit 15. ) And are formed by.

[Lower guide member 90]
As shown in FIG. 2, the lower guide member 90 is roughly divided into a rotation shaft 93 (an example of the rotation shaft of the present invention) and a front guide plate 91 disposed in front of the rotation shaft. (An example of the second guide plate of the present invention) and a rear guide plate 92 (an example of the first guide plate of the present invention) disposed on the rear side of the rotation shaft 93.

  4A and 4B are schematic views showing the configuration of the lower guide member 90. FIG. 4A shows a plan view of the lower guide member 90, and FIG. 4B shows a cutting line IVB in FIG. A cross-sectional view of -IVB is shown. FIG. 4 shows a state in which the lower guide member 90 is leveled. As shown in FIG. 4, the rotation shaft 93 is formed of a round bar-like member extending in the left-right direction. The rotation shaft 93 is fixed to the printer housing 15.

  As shown in FIG. 4, the front guide plate 91 and the rear guide plate 92 are made of flat plate-like members having substantially the same width as the width of the paper feed tray 78. Bearings 94 are provided at both left and right ends at the rear end of the front guide plate 91. A rotating shaft 93 is inserted into a shaft hole (not shown) provided in the bearing 94. As a result, the front guide plate 91 can be rotated around the rotation shaft 93 with its front end as a rotation free end. Further, bearings 95 are provided at both the left and right ends at the front end of the rear guide plate 92. A rotating shaft 93 is inserted into a shaft hole (not shown) provided in the bearing 95. As a result, the rear guide plate 92 can be rotated around the rotation shaft 93 with the rear end as a rotation free end. That is, the front guide plate 91 and the rear guide plate 92 are rotatably supported by the common rotation shaft 93.

  As shown in FIG. 4, the rear guide plate 92 is disposed on the upper side of the paper feed roller 25. Therefore, when the rear guide plate 92 rotates downward about the rotation shaft 93, the lower surface of the rear guide plate 92 and the roller surface of the paper feed roller 25 come into contact with each other.

  Moreover, both the front guide plate 91 and the rear guide plate 92 are formed to have the same thickness, and are formed of the same material. However, the rear guide plate 92 is formed longer in the front-rear direction 8 than the front guide plate 91. Therefore, the rear guide plate 92 is heavier than the front guide plate. Therefore, in a state in which the rotary shaft 93 is rotatable as described above, the moment that the rear guide plate 92 tries to rotate downward is larger than the moment that the front guide plate 91 tries to rotate downward. Such a moment difference is realized by providing a weight difference between the rear guide plate 92 and the front guide plate 91. By providing such a weight difference, a downward biasing force is applied to the rear guide plate 92 so that a downward moment acting on the rear guide plate 92 is larger than a downward moment acting on the front guide plate 91. It is an example of the grant means to give. The biasing means of the present invention may be realized by means different from the above weight difference. For example, as another example of the urging means, a torsion coil spring that urges the rear guide plate 92 downward may be attached to the rotating shaft 93.

  As shown in FIG. 4, two protrusions 101 (an example of the second engagement portion of the present invention) are provided on the lower surface of the front guide plate 91. The protrusions 101 are provided at both ends in the left-right direction at the front end of the front guide plate 91. The protrusion 101 protrudes downward from the lower surface of the front guide plate 91. The protrusion 101 is supported in contact with the support portion 57 described above in a state where the paper feed tray 78 is mounted on the printer housing 14. As a result, as shown in FIG. 2, an inclined path 67 </ b> A extending from the branch port 36 to the rotation shaft 93 is formed by the front guide plate 91. An inclined surface 104 that is inclined with respect to the lower surface of the front guide plate 91 is formed on the front side of the protrusion 101. The inclined surface 104 is for facilitating the insertion operation of the paper feed tray 78 with respect to the printer housing 14.

  In addition, two protrusions 102 (an example of the first engaging portion of the present invention) are provided on the lower surface of the rear guide plate 92. The protrusions 102 are provided at both ends in the left-right direction at the rear end of the rear guide plate 92. The protrusion 102 protrudes downward from the lower surface of the rear guide plate 92. The protrusion 102 is supported by contacting the above-described support portion 57 in a state where the paper feed tray 78 is mounted on the printer housing 14. As a result, as shown in FIG. 2, a straight path 67 </ b> B from the rotation shaft 93 to the joining portion 37 is formed by the rear guide plate 92. That is, when the paper feed tray 78 is mounted on the printer housing 14, the reverse guide path 90 is formed by the lower guide member 90 so that the recording paper can be guided to the curved path 65A. The posture of the lower guide member 90 in which the reverse conveyance path 67 is formed in this way corresponds to the first posture of the present invention.

  An inclined portion 97 is formed at the rear end of the rear guide plate 92 so as to incline backward and obliquely upward. The inclined portion 97 is connected to the curved path 65 </ b> A at the joining portion 37. For this reason, the direction of the recording paper conveyed horizontally rearward from the straight path 67B is changed upward by the inclined portion 97. Therefore, the recording paper from the straight path 67B toward the curved path 65A is smoothly conveyed.

  The front guide plate 91 is provided with two regulating pieces 105 (an example of the second support mechanism and the protruding piece of the present invention) formed in a curved shape. These restricting pieces 105 are provided at predetermined intervals in the left-right direction central portion at the rear end of the front guide plate 91. The restricting piece 105 protrudes downward from the lower surface of the front guide plate 91 and is generally formed in an arc shape centering on the rotation shaft 93. When the front guide plate 91 and the rear guide plate 92 are rotated downward, the restricting piece 105 does not bring the guide plates 91 and 92 closer than an angle θ (see FIG. 5D) described later. It is something to regulate.

[Operation of Lower Guide Member 90]
Hereinafter, the operation of the lower guide member 90 will be described with reference to FIG. FIG. 5 is a schematic cross-sectional view for explaining the operation of the lower guide member 90. FIG. 5A shows a mounted state of the paper feed tray 78, FIG. 5B shows a state where the paper feed arm 26 is supported by the paper feed tray 78, and FIG. A state in which only the front guide plate 91 is lifted by the paper feed tray 78 is shown, and (D) shows that the paper feed tray 78 is not attached and both the rear guide plate 92 and the front guide plate 91 are supported. The released state is shown. In FIG. 5, for the convenience of explanation, the illustration of components other than the lower guide member 90 and the paper feed tray 78 is omitted. Further, the feeding unit 15 is indicated by a wavy line.

  As described above, in this embodiment, as shown in FIG. 5A, when the paper feed tray 78 is mounted on the printer housing 14, the inclined path 67A is formed by the front guide plate 91. Then, a straight path 67B is formed by the rear guide plate 92. When the paper feed tray 78 is extracted from this state, first, the protrusion 102 is not supported by the support portion 57 (see FIG. 5B). In the state shown in FIG. 5B, the paper feed tray 78 supports the paper feed arm 26. In this state, the paper feed roller 25 is in contact with the lower surface of the rear guide plate 92, so that the paper feed roller 25 supports the rear guide plate 92 so as to lift upward.

  When the paper feed tray 78 is further extracted, as shown in FIG. 5C, the paper feed arm 26 is not supported, and the paper feed roller 25 rotates toward the bottom surface of the printer housing 14. , Collide with its bottom and stop. Further, the rear guide plate 92 is also rotated downward, and comes to rest when the lower surface of the rear guide plate 92 contacts the paper feed roller 25. As described above, since the paper feed roller 25 is made of an elastic member, when the paper feed roller 25 collides with the bottom surface, and the lower surface of the rear guide plate 92 contacts the paper feed roller 25. Occasional collision noise is suppressed.

  Further, when the paper feed tray 78 is extracted and the paper feed tray 78 is separated from the lower guide member 90 as shown in FIG. 5D, the protrusion 101 is not supported by the support portion 57. Thereby, the front guide plate 91 rotates downward. When the front guide plate 91 rotates downward and the angle formed by the front guide plate 91 and the rear guide plate 92 becomes an angle θ (corresponding to a predetermined angle of the present invention), the tip of the regulating piece 105 is moved to the rear guide plate 92. The front guide plate 91 and the rear guide plate 92 are regulated so as not to approach any further. As described above, since the rear guide plate 92 has a larger downward moment than the front guide plate 91, the rear guide plate 92 is not lifted by the contact of the regulating piece 105.

  In the present embodiment, the angle θ is a position where the front end of the front guide plate 91 is separated from the bottom surface of the printer housing 14 in a state where the paper feed tray 78 is pulled out from the printer housing 14 (unmounted state). The angle is set so that it can be stopped. Therefore, even if the paper feed tray 78 is pulled out, the front guide plate 91 does not collide with the bottom surface of the printer housing, so that the front guide plate 91 is prevented from being damaged due to the collision, and the occurrence of collision noise is prevented.

  When the paper feed tray 78 is inserted into the printer housing 14, first, the separation inclined plate 22 of the paper feed tray 78 contacts the inclined surface 104 of the protrusion 101. The separation inclined plate 22 moves rearward while sliding against the inclined surface 104, and the front guide plate 91 is lifted upward along with the movement. The protrusion 101 rides on the support portion 57 and is supported by the support portion 57 (see FIG. 5C). At this time, an inclined path 65 </ b> A is formed by the front guide plate 91. When the paper feed tray 78 is further inserted to the back, the separation inclined plate 22 lifts the paper feed arm 26 and the paper feed roller 25 (see FIG. 5B). 92 is lifted. Then, the protrusion 102 rides on the support portion 57 and is supported by the support portion 57 (see FIG. 5A). At this time, a straight path 65 </ b> B is formed by the rear guide plate 92.

[Effect of the embodiment]
Since it is configured in this manner, the rear guide plate 92 and the front guide plate 91 rotate downward when the paper feed tray 78 is pulled out of the printer housing 14. When the rear guide plate 92 pivots downward about the pivot shaft 93, the straight path 67B of the reverse conveyance path 67 is expanded in the height direction. For this reason, even if the recording paper is jammed in the reversal conveyance path 67, if the rear cover 18 is opened, the jammed recording paper can be easily accessed, so that the recording paper can be easily removed. Further, when the front guide plate 91 rotates downward about the rotation shaft 93, the inclined path 67A of the reverse conveyance path 67 is expanded in the height direction. For this reason, even when the recording paper is jammed in the reverse conveyance path 67, the jammed recording paper can be easily accessed from the opening 13 of the printer casing 14, and therefore the recording paper can be easily removed.

  In the above-described embodiment, the projection 101 is provided on the front guide plate 91 and the projection 102 is provided on the rear guide plate 92. However, the projection 101 and the projection 102 are provided on the front guide plate 91 and the rear guide plate 92. In addition, the present invention can be applied even if the projections similar to the projections 101 and 102 are provided on the side plates 55 and 56 of the paper feed tray 78.

[Modification of Embodiment]
FIG. 6 is a schematic view showing a configuration of a lower guide member 90 according to a modification of the present invention, in which (A) shows a plan view of the lower guide member 90, and (B). A sectional view taken along line VIB-VIB in (A) is shown. As shown in FIG. 6, in order to convey the recording paper guided to the reverse conveyance path 67 to the curved path 65A, the reverse conveyance path 67 is brought into contact with the conveyance roller 108 and the pinch roller 109 (this book) which is driven by being pressed against the conveyance roller 108. An example of a pair of conveying rollers of the invention is provided. In this modification, the transport roller 108 is supported by a rotating shaft 93, and the pinch roller 109 is rotatably supported by a support shaft (not shown) above the transport roller 108. In this case, since the rotation shaft 93 can be used also as the support shaft of the transport roller 108, the apparatus can be made more compact. Further, since the front guide plate 91 and the rear guide plate 92 are lowered downward with the portion where the conveyance roller 108 is located as a fulcrum, even when the recording paper is jammed while being pinched by the conveyance roller 108 and the pinch roller 108 Since the sandwiched portion can be accessed from both the front and back of the apparatus, it is easy to remove the recording paper. In this modification, the pinch roller 109 may be pivotally supported on the rotation shaft instead of the transport roller 108.

DESCRIPTION OF SYMBOLS 10 ... Multifunction machine 11 ... Printer part 14 ... Printer housing 15 ... Feeding part 18 ... Back cover 24 ... Image recording part 25 ... Paper feed roller 65 ... Sheet conveying path 65A ... curved path 67 ... reverse conveying path 90 ... lower guide member 91 ... front guide plate 92 ... rear guide plate 93 ... rotating shafts 101, 102 ...・ Protrusions 105 ... regulating piece 108 ... conveying roller 109 ... pinch roller

Claims (6)

A tray provided so as to be insertable / removable with respect to the apparatus main body from the front of the apparatus main body, and holding a sheet member on which an image is recorded;
An image recording unit provided on the upper side of the tray;
A back cover that can be opened and closed on the back surface of the apparatus main body, forms a curved curved conveyance path from the tray to the image recording unit in a closed state, and opens the curved conveyance path in an opened state. When,
A first guide plate and a second guide plate provided between the tray and the image recording unit, and sheet members that have passed through the image recording unit are sequentially placed on the second guide plate and the first guide plate. A guide member for guiding to the curved conveyance path through,
The second guide plate is pivotally supported with the front end serving as a pivot free end, and the first guide plate is pivotably supported with the rear end serving as a pivot free end. The axis,
Applying means for applying a downward biasing force to the first guide plate such that a downward moment acting on the first guide plate is greater than a downward moment acting on the second guide plate;
A first support that supports the guide member against the moment so as to be in a first posture capable of guiding the sheet member to the curved conveyance path in response to the tray being inserted into the apparatus main body. Mechanism,
When the tray is removed from the apparatus main body, the support by the first support mechanism is released, and the guide plates that are rotated downward support the guide member so as to be in a second posture at a predetermined angle. A second support mechanism that
An image recording apparatus comprising: It is composed of two rollers pressed in the vertical direction, further comprising a pair of conveyance rollers that conveys the sheet member guided by the guide member toward the curved conveyance path,
The image recording apparatus according to claim 1, wherein one of the conveying roller pairs is rotatably supported by the rotation shaft.   2. The predetermined angle is an angle at which a front end of the second guide plate can be stopped at a position separated from a bottom surface of the apparatus main body in a state where the tray is removed from the apparatus main body. Or the image recording apparatus of 2. An elastic member is provided between the tray and the guide member, the roller surface is provided with an elastic member, and further includes a feeding roller for feeding the sheet member held on the tray to the curved conveyance path,
4. The first guide plate according to claim 1, wherein the first guide plate rotates downward when the tray is removed from the apparatus main body, and stops by contacting the roller surface of the feeding roller. Image recording device. The first support mechanism includes:
A first engaging portion provided on the lower surface of the first guide plate, and when the tray is mounted on the apparatus main body, the first engaging portion is engaged with the first engaging portion from below. A first support for supporting the lift;
A second engagement portion provided on the lower surface of the second guide plate, and when the tray is mounted on the apparatus main body, engages with the second engagement portion to bring the second guide plate from the lower side. The image recording apparatus according to claim 1, further comprising a second support part that supports the lifter so as to lift it. The second support mechanism has a projecting piece projecting from the vicinity of the rotation shaft in one of the guide plates.
The image recording apparatus according to claim 1, wherein the protruding piece maintains an angle formed by each guide plate at the predetermined angle by contacting a tip of the protruding piece with the other guide plate.

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